R: Sample n rows from a disk.frame

sample_frac.disk.frame {disk.frame}

R Documentation

Sample n rows from a disk.frame

Sample n rows from a disk.frame

## S3 method for class 'disk.frame'
sample_frac(tbl, size = 1, replace = FALSE, weight = NULL, .env = NULL, ...)

`tbl`	tbl of data.
`size`	For `sample_n()`, the number of rows to select. For `sample_frac()`, the fraction of rows to select. If `tbl` is grouped, `size` applies to each group.
`replace`	Sample with or without replacement?
`weight`	Sampling weights. This must evaluate to a vector of non-negative numbers the same length as the input. Weights are automatically standardised to sum to 1. This argument is automatically quoted and later evaluated in the context of the data frame. It supports unquoting. See `vignette("programming")` for an introduction to these concepts.
`.env`	This variable is deprecated and no longer has any effect. To evaluate `weight` in a particular context, you can now unquote a quosure.
`...`	ignored

cars.df = as.disk.frame(cars)

collect(sample_frac(cars.df, 0.5))

# clean up cars.df
delete(cars.df)

[Package disk.frame version 0.3.4 Index]